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Porous Al 2 O 3 /20 vol% LaPO 4 and Al 2 O 3 /20 vol% CePO 4 composites with very narrow pore‐size distribution at around 200 nm have been successfully synthesized by reactive sintering at 1100°C for 2 h from RE 2 (CO 3 ) 3 · x H 2 O (RE = La or Ce), Al(H 2 PO 4 ) 3 and Al 2 O 3 with LiF additive. Similar to the previously reported UPC‐3Ds (uniformly porous composites with a three‐dimensional network structure, e.g. CaZrO 3 /MgO system), decomposed gases in the starting materials formed a homogeneous open porous structure with a porosity of ∼40%. X‐ray diffraction, 31 P magic‐angle spinning nuclear magnetic resonance, scanning electron microscopy, and mercury porosimetry revealed the structure of the porous composites.
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Suzuki et al. (2005) studied this question.
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